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Integrated water vapor during active and break spells of monsoon and its relationship with temperature,precipitation and precipitation efficiency over a tropical site

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Geodesy and Geodynamics 2022年第3期13卷 238-246页

作者： Nirmala Bai Jadala Miriyala Sridhar gopa Dutta Mohammed Yousuf Y.K.Reddy Department of ECE Koneru Lakshmaiah Education FoundationVaddeswaramGuntur Dt522502A.PIndia Vignana Bharathi Institute of Technology GhatkesarMedchal DtTelangana501301India India Meteorological Department HyderabadTelangana500016India

Global Positioning System(GPS)measurements of integrated water vapor(IWV)for two years(2014 and 2015)are presented in this paper.Variation of IWV during active and break spells of Indian summer monsoon has been studied for a tropical station Hyderabad(17.4°N,78.46°E).The data is validated with ECMWF Re-Analysis(ERA)91 level data.Relationships of IWV with other atmospheric variables like surface temperature,rain,and precipitation efficiency have been established through cross-correlation studies.A positive correlation coefficient is observed between IWV and surface temperature over two years.But the coefficient becomes negative when only summer monsoon months(June,July,August,and September)are considered.Rainfall during these months cools down the surface and could be the reason for this change in the correlation coefficient.Correlation studies between IWV-precipitation,IWVprecipitation efficiency(P.E),and precipitation-P.E show that coefficients are-0.05,-0.10 and 0.983 with 95%confidence level respectively,which proves that the efficacy of rain does not depend only on the level of water vapor.A proper dynamic mechanism is necessary to convert water vapor into the rain.The diurnal variations of IWV during active and break spells have been analyzed.The amplitudes of diurnal oscillation and its harmonics of individual spell do not show clear trends but the mean amplitudes of the break spells are approximately double than those of the active spells.The amplitudes of diurnal,semidiurnal and ter-diurnal components during break spells are 1.08 kg/m^(2),0.52 kg/m;and 0.34 kg/m;respectively.The corresponding amplitudes during active spells are 0.68 kg/m^(2),0.41 kg/m;and 0.23 kg/m;.

关键词： Precipitation efficiency Diurnal oscillation Integrated water vapor Tropical site Break spells of monsoon Active spells of monsoon

Modeling of tunneling current density of GeC based double barrier multiple quantum well resonant tunneling diode

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Journal of Semiconductors 2018年第10期39卷 34-38页

作者： Swagata Dey Vedatrayee chakraborty Bratati Mukhopadhyay gopa Sen Institute of Radio Physics and Electronics University of CalcuttaKolkata 700009India B.p.Poddar Institute of Management and Technology(ECE Dept) Kolkata 700052India

The double barrier quantum well（DBQW） resonant tunneling diode（RTD） structure made of SiGeSn/GeC/SiGeSn alloys grown on Ge substrate is analyzed. The tensile strained Ge（1-z）Cz on Si（1-x-y）GexSny heterostructure provides a direct band gap type I configuration. The transmission coefficient and tunneling current density have been calculated considering single and multiple quantum wells. A comparative study of tunnelling current of the proposed structure is done with the existing RTD structure based on GeSn/SiGeSn DBH. A higher value of the current density for the proposed structure has been obtained.

关键词： DBQW MQW RTD NDR tunneling current density

Impact of Cyclone Nilam on Tropical Lower Atmospheric Dynamics

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Advances in Atmospheric Sciences 2016年第8期33卷 955-968页

作者： P.VINAY KUMAR gopa DUTTA M.V.RATNAM E.KRISHNA B.BAPIRAJU B.Venkateswara RAO Salauddin MOHAMMAD Vignana Bharathi Institute of Technology HyderabadTS 501301India National Atmospheric Research Laboratory GadankiAP 517112India Jawaharlal Nehru Technological University HyderabadTS 500085India

A deep depression formed over the Bay of Bengal on 28 October 2012, and developed into a cyclonic storm. After landfall near the south coast of Chennai, cyclone Nilam moved north-northwestwards. Coordinated experiments were conducted from the Indian stations of Gadanki（13.5？N, 79.2？E） and Hyderabad（17.4？N, 78.5？E） to study the modification of gravity-wave activity and turbulence by cyclone Nilam, using GPS radiosonde and mesosphere–stratosphere–troposphere radar data. The horizontal velocities underwent large changes during the closest approach of the storm to the experimental sites. Hodograph analysis revealed that inertia gravity waves（IGWs） associated with the cyclone changed their directions from northeast（control time） to northwest following the path of the cyclone. The momentum flux of IGWs and short-period gravity waves（1–8 h） enhanced prior to, and during, the passage of the storm（±0.05 m2s-2and ±0.3 m2s-2, respectively）, compared to the flux after its passage. The corresponding body forces underwent similar changes, with values ranging between ±2–4m s-1d-1and ±12–15 m s-1d-1. The turbulence refractivity structure constant（C2n） showed large values below 10 km before the passage of the cyclone when humidity in the region was very high. Turbulence and humidity reduced during the passage of the storm when a turbulent layer at ～17 km became more intense. Turbulence in the lower troposphere and near the tropopause became weak after the passage of the cyclone.

关键词： inertia gravity waves turbulence momentum flux convective process tropical cyclone

VINCENT IN VOGUE ‘ARTISTIC CONSUMPTION’—AND A TRADITION OF REPLICAS—DRIVE CHINA'S VAN GOGH FEVER

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The World of Chinese 2018年第2期 6-7页

作者： gopa BISWAS CAESAR HATTY LIU

"Van Gogh...[there's]a lot in China,"says the cashier at a souvenir shop near the"Little Potala Palace"in Chengde,Hebei.Here,one can send postcards from a Cafe Terrace or buy jigsaw puzzles of Starry Night stacked next to Tibetan Buddhist memorabilia.Shopping online,or visiting gift shops,breweries,or cafes on the mainland,it's easy to fell under the Dutch master's spell.

关键词：英语学习学习方法阅读知识阅读材料

Hydroxy Propyl Methyl Cellulose： Different Aspects in Drug Delivery

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Journal of Pharmacy and Pharmacology 2016年第8期4卷 381-385页

作者： Tamasree Majumder gopa Roy Biswas Sutapa Biswas Majee Department of Pharmaceutical Technology NSHM Knowledge Campus-Group of Institutions Kolkata 700140 West Bengal India

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拆掉的匆匆过往（英文）

The World of Chinese 2018年第2期 24-29页

作者： gopa BISWAS CAESAR

Gentrification and an urban safety campaign saw the exodus of thousands of migrants from Beijing's suburban villages this winter. As bulldozers arrived in the alleys overnight, residents and business-owners left with whatever they can carry. TWOC visits two such neighborhoods in their last days, as residents pick up their bags, and try to make their last few kuai before the

关键词：英语学习学习方法阅读知识阅读材料

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声波测井新技术

国外测井技术 2007年第2期22卷 53-66页

作者： J.L.Arroyo Franco M．A．Mercado rtiz gopa S．De Lasse Renlie Stephen williams 墨西哥国家石油公司勘探与生产分公司墨西哥Reynosa 雪弗龙能源技术公司美国加利福尼亚州San Ramon 挪威国家石油公司挪威Stjφrdal 挪威海德鲁公司挪威卑尔根

自50年前问世以来，声波测井技术已经取得了长足进展。最新的声波测井技术能够提供迄今为止最高质量的数据，根据声波测量数据能够描述井眼周围和距离井眼数十英尺深地层的力学和流体特性。

关键词：声波测井技术流体特性测量数据井眼质量力学地层距离

通过分子生物学、组织学及临床检测手段对比研究视黄醇和视黄酸作用在人体皮肤上的功效

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通过分子生物学、组织学及临床检测手段对比研究视黄醇和视黄酸作...